Arrange the stages of microsporogenesis in their order of occurrence
(A) Development of pollen from microspores
(B) Formation of microspore tetrad
(C) Sporogenous tissue occupies the center of microsporangium
(D) Meiotic division in the cells of sporogenous tissue
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The correct sequence of steps involved in polymerase chain reaction (PCR) are:
A. DNA polymerase is used to extends the primers using oligonucleotides.
B. Desired DNA fragments are denatured.
C. Amplified fragments are ligated with the vector for cloning.
D. Oligonucleotides are added
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The process of breeding crops for higher level of proteins, vitamins and/or oil content is called

Which one of the following is a correct statement about dormancy?

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Recombinant DNA Technology Asexual reproduction preserves the genetic information, while sexual reproduction permits variation. Traditional hybridization procedures used in plants and animals breeding very often lead to inclusion and multiplication of undesirable genes along with the desired genes. The techniques of genetic engineering, which include creation of recombinant DNA, use of gene cloning and gene transfer, overcome this limitation and allow us to isolate and introduce only one or a set of desirable genes without introducing genes into the target organism.
In Recombinant DNA Technology, what is the role of the "selectable marker gene"?

Which of the following is NOT a means of transmission of Sexually Transmitted Infections (STIs)?

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In our body, cell growth and differentiation is highly controlled and regulated. In cancer cells, there is breakdown of these regulatory mechanisms. Cancerous cells just continue to divide giving rise to masses of cells called tumors. Benign tumors normally remain confined to their original location. The malignant tumors, on the other hand are a mass of proliferating cells. These cells actively divide and starve the normal cells by competing for vital nutrients. Cells sloughed from such tumors reach distant sites through blood, and wherever they get lodged in the body, they start a new tumor there. This property is called metastasis. Transformation of normal cells into cancerous cells may be induced by physical, chemical or biological agents called carcinogens.
Normal cells show a property that does not allow their uncontrolled growth. This property is known as:

A coin is biased so that the head is three times as likely to occur as tail. If the coin is tossed twice, the mean of the number of tails is:

The process used for the conversion of sugar into Ethanol is :

Young's double slit experiment is carried out using green, yellow, red, and blue lights one by one. Arrange the expected values of fringe widths (\( \beta \)) in increasing order :
(A) \( \beta_{Green} \)
(B) \( \beta_{Yellow} \)
(C) \( \beta_{Blue} \)
(D) \( \beta_{Red} \)
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Which of the following has the highest molar conductivity?

Match List-I with List-II

List-I	List-II
(A) Rutherford	(I) Nuclear model of atom
(B) A.H. Becquerel	(II) Plum-Pudding Model of atom
(C) Niels Bohr	(III) Radioactivity
(D) J.J. Thomson	(IV) Hydrogen atom model

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Arrange the following events in correct sequence :
(A) Virus infects macrophages
(B) Viral DNA is produced by reverse transcriptase
(C) Viral DNA incorporates into host genome
(D) Viral RNA is introduced into macrophages
(E) New viruses are produced
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